You can Like another user's post/ profile in 3 ways:
1) Teary-eyed from laughing at a witty post? Use one hand to like a post from the home stream, and the other to grab a tissue.
2) Tap into the post/profile, then tap the Like icon above the post/profile.
3) Longpress (tap and hold) the piece of content until a dialogue box appears. Select "Like".
- Like stuff YOU like. If it gets a ton of Likes, it will have a better chance of trending/being featured on the main stage.
- Like someone else to make friends and filter your Following feed conversation by what they post.