Holy Trinity of E-Learning :
When we go to market to buy any product we always check that is it useful, usable or is it desirable good for what so ever amount i'm paying. Yes we do so ! because we know we are paying for it so it must be as per the requirements and it should satisfy our need. It should fulfill our need and we must reach the good level of utility for that product or service. Same applies here for the E-Learning also.

Useful or not ? 
There's always a click in the mind that :
Learners or users will actually find it useful or not? 
They will be able to know that they are on the right track or not? Is it easy to navigate or not?
Does your material acknowledge goal competition?
Is the content provided is tailored to fit learners real life situation ?
- all such question comes up to our minds when ever we share data or other information with the public that is this even valuable.

Usable ?
The information and knowledge shared with the students on the online courses should provide them with the more clarity to the subject. So that learners can easily  find out what they are looking for ! what we should kept in mind is that the material provided to the learners should be readable and understandable to them.

Desirable ?
The course, the data provided for study; they become valuable only when attracts more learners. When the posts, data shared, documents, etc. starts getting good reach from public that means the information so provided is valuable and is having some useful  content for others. That it is influencing more learners for its use.

Here comes a bit of more information that i found relevant and useful for the topic:

Connecting with Learners:  A very important topic in technology-mediated distance education. Setting the tone from the beginning is an effective way to close the transactional distance between the instructor and the students, who many never meet each other physically during the semester. How do you do it effectively? Well - it's not an exact science and there is more than one way to accomplish this task. Do you want to see how most of them do it?

It is done in three parts:

Part 1.  write an email message to the students the week before class. The purpose is five-fold: 1) to confirm their email address on file is correct, 2) to share my contact information, 3) to share a link to a 10-minute video intro of the course, 4) to share some ground rules of the course, 5) to give them a task of preparing a personal bio/intro for themselves, and 6) to share the Course Outline. 

Part 2. As  mentioned in Point 1 above,  make a 10-minute video intro for the course. It's purposefully and simply just a talking head on YouTube. Spend time giving them perspective on the course and the online course delivery method. The goal is to convey that together we are a learning team.

Part 3. Ask them to prepare a personal bio/intro (and I give them specific criteria to include). The goal of the activity is to establish Social Presence in the course. 

That's the best way to remain Extrovert and Socially Connected with your students.