We’re looking into expired SSL certificate errors now and working quickly to resolve it. The problem affects a small portion of TweetDeck API requests.

See more here:
SSL Certificate Errors

We’ve temporarily disabled avatar upload as we do some work; we’ll update again when it’s reenabled.

Update (18:10 PST, 01:10 UTC): Avatar uploading is reenabled.

Read more from the original source:
Avatar Upload Temporarily Disabled

In a related issue (that is also being worked on), our help center is currently down; we’re working to bring it back up.

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Twitter Help Center Temporarily Down

We’re currently working on remedying the issue blocking users from updating their profiles.

Here is the original post:

Users Cannot Update Profiles

It’s a  known issue that is now resolved. All followings and unfollowings are now real-time and up to date.

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Had trouble following people?

We are aware of an SSL issue on our API and are in the process of fixing it. This issue does not pose a threat to account security.

Here is the original post:

SSL Issue

Many users are receiving incorrect “Rate Limit Exceeded” errors through the Twitter API. We are investigating the cause and will update when it is resolved.

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Investigating "Rate Limit Exceeded" issues

We’re hearing reports from developers that they’re running into some incorrect rate limits; we’re looking into it.

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Incorrect Rate-Limiting

We’re working to resolve an issue with the mobile website, http://mobile.twitter.com.

UPDATE: Resolved at 15:31 UTC / 8:31 PDT.

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Mobile Website

Some users are experiencing an issue in which they’re not receiving all of their @ replies; we’re working on a fix.

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Missing @ Replies