Twitter Backgrounds-Do you use them?

Normally, don't add more than 300 friends in one day.
It is better if you can add friends with interval.
For example, with 60 second interval is recommended.
Following is the suspended reasons from the help of twitter website.

One or more of these things may cause an account to be flagged for review:

1) a large number of people block the profile in question
2) a large number of people write in with spam complaints for a specific profile
3) a large number of people are followed in a short amount of time
4) the number of followers is small compared to number of people following
5) updates consist of duplicate links and/or text
6) updates consist mainly of links and not personal updates
7) updates consist solely of "re-tweets" (poaching other users' updates)
8) updates consist of links pointing to phishing sites, malware, or other harmful material
9) a large number of accounts is created in a short amount of time
10) an account is identified as belonging to a group of spam accounts