How to spot fake Twitter followers (bots)?
How twitter bots may harm you?
Bots, fake users and spammers are quite a problem for Twitter itself, as well as for Twitter users, especially in terms of buying followers.
There are several tools that help recognize fake accounts within Twitter audience (including our BotOrNot). We want to open the curtain  and show you how these services work and what kind of rules they use to decide whether account is fake or not.
We’ve made a list of the most common rules that will help spot a bot at a glance.
Account’s following/followers ratio is about 50:1, or more (huge amount of following accounts compared to number of followers)
Majority of tweets contain spam phrases like “diet,” “make money” etc
Their Twitter feed is overwhelmed with quotes
they are retweeting tweets from one account only (usually it’s quite a popular account)
More than 90% of the account’s tweets are retweets or links.
The user hasn’t tweeted at all, or posted less than 3 tweets
No profile picture: the account has a default profile image (while being more than two months old)
Bio and location are not filled in
The last tweet is more than 90 days old
They usually send direct responses
Bots tweet the same thing multiple times
Their Twitter handle contains symbols or/and random numbers
beautiful profile picture ( the vast majority of Twitter bots are designed to appeal to hetero men)
they follow a big number of accounts daily
Fake followers usually do not reply to tweets, do not retweet. They don’t really follow you - so think carefully and check twice if you ever decide to buy a bunch of followers.