1st is Andy and he had the most professional PR. Many times I would read the episode updates on twitter and Andy's team would constantly tweet all d footage that andy would get in a positive way and Colors' would retweet dem.
Then der was this FB page tht would do live updates of the LF nd would post anti-Gau updates and many times even false info abt Gau in LF to show her in d -ve. It was only later whn Armaan was evicted and did dey post a pic of Armaan wid some guy mentioning he was arman's relative and admin of the page, dat it came to light tht it was run by armaan's PR.
Sangram too had his PR team in place and also his own web page and when Cruiser exposed him did his team make changes to the false claims on his website.
Kushal too had a PR team as mentioned by Salman.
Other than tht, der is no sure info abt the other housemates.
As far as Gauhar is concerned, though her Twitter account said it was being handled by her team, der were just a couple of tweets frm he account throughout her stay in BB and dey were posted by Nigaar. I don't know how ppl come to the conclusion tht all anti-armaan tanisha articles were posted by Gauahar's PR when der is no evidence to show dat and it was actually their behavior in BBH dat led to such articles and now dat dey r out, dey r facing d reality of their actions, whcih were shielded for dem by the host whn dey were in BBH.