Do you use any tool for social media conversation?

Hi, I have a decent LinkedIn with almost 1.9k connection, and a recently active twitter account and a Facebook account. Creating and sharing content is one aspect of building engagement and connections. But the real relationship and connections comes from direct conversations through direct messages. After started regular messaging in LinkedIn and twitter, i found it difficult to manage two different platform that takes time. If you are targeting social media for marketing and leads it will get more worse. These are the pain that i identified. 1. Time for managing each platform is more. 2. Getting connected with previous conversations is tedious. 3. To manage and remember contacts in multiple social networks are tedious. 4. Convert contacts into leads takes lot of efforts. 5. Segment your contacts across social networks to manage priorities. Do you encounter these difficulties yourself? Any tool recommended or you anticpate?