Ideally, we'd like you to use PTAsocial on Chrome. However it should work on most up to date version of common web browsers on any internet-enabled device, including smart phones. If you experience any problems, please ensure you are using the latest version of your browser and if problems persist just give us a shout on firstname.lastname@example.org with as much detail as you can about what device, browser and version you are using, and what you tried to do, what happened etc.
Just be aware that there are a few "manager features" that are only possible on a desktop/laptop though, e.g. re-ordering tasks and activities.