In most cases, the answer is that they're trying to achieve the appearance of legitimacy, so that when they subtly (or not so subtly) start hawking whatever they're trying to sell, the site/community doesn't immediately flag them as a spammer/bot.
Kinda like why in the old days, you'd see comment spam with a lengthy but meaningless auto generated message to go with it.
Alternatively, it might be to sell said account to spammers later down the line, since said spammers want to buy social media accounts that have a bunch of legitimate activity associated with them.
Kinda like why in the old days, you'd see comment spam with a lengthy but meaningless auto generated message to go with it.
Alternatively, it might be to sell said account to spammers later down the line, since said spammers want to buy social media accounts that have a bunch of legitimate activity associated with them.