Instead of posting (spamming. eh!) to Facebook group and pretending you are suggesting solution to others (but it's your product) you can actually do this:
Promoting solution to technical people is very different compared to promoting tupperware to your mama. Technical peoples are smart people and you can't hard sell product because they can smell marketing effort 1mile from them. Phew.
However, you can put disclaimer under the post like. " I work on this product" and what not.