Thanks for this post that will helps many beginners users , absolutely you need the account ID for signature compagne, also for tracking users or just by using telegram..
If anyone wants to know the account ID of anyone, they can just look for the profile of that account and can easily see their user ID. If one wants to know his user ID, he can just click his own profile and click summary, and his profile ID is revealed. Also Simply clicking the username of the account that replies on the thread can redirect us to their profile showing their account/user ID.
This is just a trick @OP wanted to share, I do not see any wrong with this
Have you tried using other numbers aside 2 and 3 the last digits of numbers are each user's uid and am not sure if it was given as according to how every user's account was created or was just a random numbers, to me this may not be a trick because if you edited it, it will surely gives you someone's profile as long as the inserted number(s) are within the set range of all forum user's unique identification numbers.
Well, this is getting the user account through merit access and not the usual clicking of the account profile, it is somehow a different "trick" to get the user profile and account ID, although I do not see any importance to it, maybe others will find it amazing. Besides, each member has the right to create their own topic they want, so let us just respect that. Whether someone will merit this kind of thread is up to them, giving merit as we all know is subjective.