The website can provide Pepsi with your IP address. And remove posts they don't want that have accurate information. The bait you to reply and add posts to get the gossip and rumors that are going on around the office to properly handle internally.
They actually make decisions on just how much people share.
It is another way to control the reputation and decisions.
Watch - a baited response will be posted to engage response.
Don't get upset or even think about anyone who replies how great Pepsi is and how your a miserable ungrateful employee.