I doubt it. User growth is used as a metric to measure future ad revenue. Fake profiles aren't going to generate a lot of revenue from those ads. Facebook would simply need to make a statement about deleting a bunch of fake profiles, but they don't expect revenue to dip.
However, that is not the case for a pre-revenue or pre-profitable business. Those startups are dependent on VC funding, they might lie about users and usage to get more funding (see Silicon Valley Season 3). *This is 100% inappropriate and should not be done. You will burn credibility with investors, for your current venture and any future ventures. It's better to shut down a venture and move on, than to lie about your metrics.
