Well, so you are able to create notifications from your twitter/fb/linkedin etc. Few use-cases are well discussed in the post and I am sure their are many more. Also, it mentions "We’ll be adding complete customization capabilities (colors, targeting etc) to Notification." So there is going to be a layer of targeting. (see this http://webengage.com/features/survey-and-lead-generation | first para talks about targeting) Analytics around notification displays, clicks etc are going to be very insightful, I am sure.

In a couple of ways -

1. WebEngage notifications can be "targeted" - it means you can choose to pop the message only to visitors meeting certain criteria. E.g. only to visitors coming from Google search, only to visitors spending 30 seconds on pricing page etc.

2. Smart notifications will automatically fetch updates from your Twitter/Blog/FB etc and create a notification out of it.

3. WebEngage notifications will have a definite call-to-action and the analytics will be focused on proving you a lot of BI around clickthrough rates.

Aren't those simple wordpress plugins giving relevant suggestion from the database? Not sure if they allow us to customize those messages.