[kalkat]

thanks. Retweets is just one rule. Pretty much like google uses back links as an indicator, but has 200-300 other rules, we use retweets as an indicator but have 100+ rules probably. or around. These rules are spread across metadata analysis (language based, response type, location based filtering etc), statistical analysis(no of retweets, recency based scoring etc) and linguistic/textual analysis (syntactical construction, use of spammy words, characters etc)