If you are looking for a forum Rochester has to offer on any number of different topics, there are several different and diverse options around the Flower City to choose from. For example, if you are looking for a forum Rochester has to offer that discusses local events and politics, this may well be a completely different group than a forum Rochester has to offer that is dedicated to local gardening and horticulture. While indeed many different people can join many different forum Rochester options across the web, it should be noted that most forums do require that you keep your queries and replies germane to the topic at hand. This means avoiding a change of subject away from the primary focus of the forum Rochester has to offer that you might currently be looking at.
Once you have familiarized yourself with basic netiquette in these matters, ask yourself specifically what types of topics you wish to discuss on any forum Rochester has to offer. List these subjects specifically, and then search the web for a forum Rochester has to offer on a specific subject. Read through the threads and responses recently posted on the various forums you have in mind, and get a feel for what the general tone of the group might be before adding your two cents. Many a forum Rochester has to offer will also post a list of rules that any posters need to adhere to before being granted access to join the conversation, so make sure that you look these over carefully whenever applicable!
You can repeat the above steps in order to find any forum Rochester has to offer on various different subjects that you have in mind, and most forum software today does allow you to keep track of the activity on the threads in which you have participated. However, if you do not happen to find the right type of forum Rochester has to offer for your needs, there are a number of different free and low-cost forum creation sites out there right now that can enable you to create your own group within minutes!