The Notification Methods require the authenticated user to already be friends with the specified user otherwise the error "there was a problem following the specified user" will be returned?

What will the API call return? http://twitter.com/blocks/destroy/john.xml

You can update the status of the authenticated users using the update status method. What is the maximum length allowed for the text for your status update?

What API call return? http://twitter.com/statuses/friends_timeline.xml

What is the purpose of requesting whitelisting?

Output of API call?http://twitter.com/account/rate_limit_status.xml

An entity result has the value for the 'hashtag' property: 'hashtags':[{'indices':[32,36],'text':'lol'}] What does this value mean?

When consuming the API using JSON, it is important to always use which field instead of 'id?'

What action can help avoid rate limits?

How should you Check CRLs and the OCSP status?

What is the purpose of embeddable timelines?