Can I manually check an influencer's follower authenticity?

Look at the followers themselves, not just the count. Accounts following seven thousand people, posting nothing and using a default picture are the tell, and a sample of twenty gives you a feel within a couple of minutes.

Compare two posts a month apart. Genuine engagement varies with how good the content was, where bought engagement tends to land in a suspiciously tight band whatever the post, and that flatness is easier to see than any single figure.

Manual vetting is genuinely useful for a short list. Open a creator's recent posts and read the comments, because bought engagement tends to be generic and repetitive while real audiences ask questions and disagree.

Check the follower growth chart for unnatural jumps, then sample a handful of followers to see whether they look like real people. The limit is time, since doing this properly across dozens of creators does not scale.

That is where an automated score helps. Flinque gives every creator a fake-follower score and audience data, which turns the manual read into a quick confirmation rather than the whole job. The free checker at /free-tools/ scores a single account fast.