It's possible that your best friends are not posting pictures with you for a few reasons. Firstly, they may simply be more comfortable sharing moments with their other friends. Some people are more selective about what they share on social media, and that doesn't necessarily reflect how much they value your friendship. Additionally, your friends may be mindful of your preferences or comfort level with being featured in their posts. It's considerate of them to respect your privacy if you've expressed discomfort with being frequently posted about. The absence of joint posts doesn't necessarily mean your friendship is suffering. Focus on the quality of your time together, rather than the online presence of your relationship.