Social features, huh? Neat question. Tumblr has a bunch of stellar social features, that’s for sure.

Follow: If you see a blog you like, follow it. Now everything they post will show up in your dashboard. It’s kind of like getting married, but to a blog instead of a person and you live in a dashboard instead of a house.

On blogs, it’ll appear on the upper right hand corner of the page.
On the Dashboard, Search Results, and Tag pages, users you aren’t directly following will have a "+" next to their username. That’s the thing you’ll wanna click. You can also hover over blog avatars and click the Follow button in the popover.
Note: You can follow up to 200 blogs a day and 5,000 blogs total.

Like: You like a post? Click it right in the heart.

On blogs, you’ll see it on the upper right corner of the permalink page.
On the Dashboard, Search Results, and Tag pages, it’s at the bottom right corner of every post.

Reply: Need words to express your feelings about a post? Fine. You can respond directly on your Dashboard via the reply bubble on the bottom of the post. If you don't see it there, it may be because you’ve followed that user for less than two weeks. Otherwise you can assume that the user simply doesn’t allow replies, hasn’t enabled them, or is a lone wolf who doesn’t play by the rules.

Ask: Like asking questions? Got a question you’d like to ask another user? If they’ve enabled the Ask feature, you’ll find an Ask button or link on the blog’s main page. You can also hover over blog avatars on the Dashboard, click the person icon that appears, then select "Ask a question" in the dropdown.

Submit: Some blogs are all about making original posts, some are all about reblogging other people’s. Somewhere in between are blogs that take submissions. If you see a Submit button on their blog, just click it and compose a post you’d like for them to consider publishing. (It’s up to the blog admin as to whether or not your submission actually gets posted, of course.)

Fan Mail: Send handsome digital letters directly to other bloggers. Pick out stationery and everything. It's similar to the Ask feature, but you can’t send messages anonymously, and you can’t publish received messages to your blog.

Learn more about communicating with other users, or check out a few troubleshooting tips if you're having issues with your Inbox.

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