Not until you have matched and she has agreed in writing. The League's guidelines say you may not contact members on other social networks, by email, at their workplace or anywhere else. The one exception is someone you have connected or matched with on the app who has given you written consent. The rule covers everyone you have not matched with, and it still covers your matches until they say yes.
What the guidelines allow
The rule has two conditions, and you need both of them.
First, you have to have connected or matched with her on The League. Seeing her on the app is not enough. Second, she has to have given you written consent. A match on its own does not give you permission to look her up. Her yes does.
The places it covers are broad on purpose: other social networks, email, her workplace, and a catch-all "elsewhere." In practice, anywhere other than the chat inside The League needs both conditions met first.
Looking her up before you match
Plenty of men do this without thinking of it as contact. They see a woman on The League, find her on Instagram or LinkedIn, and write to her there because it feels bolder than waiting.
The guidelines rule it out, and it tends to go badly even where no rule exists. She chose to share a few photos and some details with men on a dating app. A message arriving somewhere she never offered tells her you went hunting for her, and most women find that unsettling rather than flattering.
If you like her, like her on the app and let the app do its job. If she is interested, you will match, and then the two of you can talk.
Her workplace is off limits
The guidelines name workplaces specifically, and that deserves its own line.
Turning up at a woman's office, calling her work number or writing to her work email because you worked out where she works is exactly what the rule exists to stop. Even with a match and a friendly chat going, her workplace is not where the conversation goes next. Her phone number is.
After you match, ask in the chat
Once you have matched and the conversation is going well, the way to take it off the app is to ask inside the chat and let her answer there.
The strongest version follows a simple order. Suggest a loose plan first, something like "we should get a drink this week." When she agrees, ask for her number so you can sort out the details. A clear yes from her, typed in the chat, is the simplest way to be sure you have the written agreement the guidelines describe.
Asking for contact before there is any plan is the weaker version. "Can I have your number?" with no reason attached reads like a man collecting numbers. A number attached to a drink on Thursday reads like a date.
Why her number beats her Instagram
Even when she is happy to connect somewhere else, a phone number is the better thing to ask for.
Social media is an unreliable place to arrange a date. Some women barely use it. Others get so many direct messages that yours sinks without a trace, and plenty switch the notifications off altogether. A text lands on the phone she checks all day.
If you do swap social accounts, do it after you have her number, never instead of it. Only offer yours if it helps you. A page that shows a real life, with friends and places in it, can help. An empty or chaotic one is better left out of the conversation.
Do not use it to sell anything
The League's guidelines also ban using the app to sell things. That covers the obvious case of pitching a product. It also covers the quieter ones men talk themselves into: a link to your business, an invitation to your event, a nudge toward your side project.
It also works against you on its own terms. A woman who matched with you wants to find out whether she would enjoy a drink with you. Treating the chat as a sales channel tells her the date was never the point.
The short version
Stay inside The League until you have a match and a clear yes from her. Use the chat to suggest a plan and get her number. Leave her workplace, her email and her social accounts alone unless she invites you there. That is the rule, and it happens to be the approach that gets you the most dates as well.
Written by Matthew Stevens, Co-Founder & Head Coach. More than half a decade coaching men across the US and worldwide.
Everything here comes out of real coaching work: the approaches, dates, texts and profiles we go through with the men we coach.