Block spam DDoS attacks from botnet

[alpet_m]

Title
Block spam DDoS attacks from botnet

Short, concise description of the idea
Conditional show captcha for users

Full description of the idea
Chaos situation repeats in http://navalny.livejournal.com/558228.html?page=378#comments for some several posts of Navalny. Spam bots filled limit of 10000 comments in this sample.

Always all bots has same properties:
a) 0-1-2..5 days after account registration.
b) void journal
c) attack only popular LJ

Just add conditions for showing strong captcha to accounts with this props (primary - a).
An ordered list of benefits

• Help to prevent spam DDoS for populal LJ.

An ordered list of problems/issues involved

• Many newbies in LJ will see captcha shown by this conditions. For them may implements countdown of passing human-tests about 3-5 comments.