If you're tired, upset or have consumed alcohol you should probably stay away from social media.
Counsellors are warning about the effects of what's being termed "digital shame" - where people regret what they say or post online.
The Irish Association of Counselling & Psychotherapy says its members are receiving an increasing number of calls from people on the issue.
Susan Keogh has been speaking to IACP Spokesman Shane Kelly about what causes 'digital shame':