[shapefrog]

95% of them are bots, that leaves only 15mil accounts.

If they all sign up, they will make an extra $1.4 bil a year, which would certainly help. But they will be getting half as many ads, so if you halve the advertising revenue that is losing $2.5 bil a year - net net a reduction of twitter revenue of $0.9bil

[dmak]

That depends. There might be a premium for advertisers to pay to target the half of ads that blue users can see.