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A casual and lowkey way to communicate with your crush is to like their pictures and posts so they know that you saw them. But don't overdo it and like a ton of their posts at one time or they may think that you're strange or possibly a stalker. For example, don't like any posts or pictures that they posted before they added you as a friend or they'll know that you were searching through their old stuff and may not want to talk to you. Avoid liking your crush's comments on other people's posts or they may think that you're obsessed with them. When you've had a few conversations with your crush, it's appropriate for you to also make comments on their social media posts. Keep the comments lighthearted and friendly so they'll feel comfortable enough to reply or comment on your own social media posts. Don't write overly long comments. Keep them short and sweet. Avoid attacking someone else who comments on their posts. You may not know their relationship, so it's not appropriate for you to add your opinion. Try not to flirt or post over-the-top compliments or it could come off as creepy and weird. Social media is great for starting casual conversations with your crush without coming on too strong. Post something that you think they'l like and tag them. Tag them in a post that you see that you think they'll enjoy. They can then comment on it and you can keep the conversation going. If your crush is into animals and you see a cute post, like a fluffy cat or an animal doing something adorable, tag your crush so they can see it and respond. Tag your crush in things that you know they'll like, don't tag them in stuff that is overly flirty or mushy or it could drive them away. Use social media platforms like Facebook, Twitter, and Instagram to tag people. Many social media platforms like Facebook, Twitter, and Instagram have a feature that allows you to send a message directly to people. Send your crush messages to talk to them there, but make sure you don't overdo it or they could block you and you won't be able to send them any messages. Don't try to flirt with them if you've just met them or it could push them away and prevent any future conversations.
Like your crush's posts on social media so they can see you. Comment on their social media posts. Tag your crush in a funny or interesting post so they can comment on it. Send your crush a direct message to talk to them.