Describe 10 proven strategies that brands and companies can use to build an engaged and loyal community on social media platforms and retain it in the long term.

Context: [Social Media, Community Management, Customer Retention, Brand Building, Engagement, Target Audience Nurturing]

Goal: [promote active community, strengthen brand loyalty, increase interactions, create sustainable customer relationships]

For each strategy explain:
1) a concrete measure or tactic for community engagement
2) practical tips for implementation and regular maintenance
3) the expected positive effect on engagement, trust, and brand loyalty

The strategies should:
- be easy to understand and directly applicable
- be suitable for various platforms (e.g. Instagram, Facebook, LinkedIn)
- be relevant for both small and large communities
- help build authentic and sustainable relationships with followers