Does anyone have some information on how instagram tracks the URLs? For example we know that there is an limit on how many of the same domains you can have across multiple accounts. However, is this the same for sub domains? Maybe more specific: is there a difference between a domain with and/or with subdomain? Also bit.ly linking for example has no benefit, instagram will track the destination url, since as far as I am aware, it acts like a 302 or 301 redirect. Giving the idea they might use crawlers to track URLs. Assuming this is the case, how far will these crawlers track an URL? A simple redirect I can understand, but what about sub domains, meta refreshes etc? If someone can shed some light on this that'd be great. Feel free to PM me if you don't want to discuss this publicly. So far I have quite a bit of accounts running the same domain but with different sub domains, however, I am trying to find out if this is pure luck or that my setup is actually working.