In online forums, social media, and question websites, "+1" typically means that the person is expressing their agreement or support with a previous comment or post. It's a way for users to indicate that they share the same opinion or have a similar viewpoint as the person they are responding to.
By replying with "+1," users can avoid writing a lengthy comment while still showing their endorsement of the original content. It's a shorthand method to add weight to a particular opinion or to acknowledge that someone has made a valid point.
Sometimes, people might also use other variations like "Agree +1" or simply "Agreed" to convey the same sentiment. The practice of using "+1" to express agreement or support has become quite common in various online communities.