I they peg SAT to Dollar when someone have to pay for ads it will be dependant to the price fluctuation. If an ad costs $1000 and SAT at the moment is valued $1, you'll spend 1000 STA or you rather wait till SAT's value go up?

That's good thinking.
On the other hand, advertisers would want to buy cheap tokens because without tokens they can't advertise. So if the value is expected to go up, you should buy now. Plus, if all other advertisers were holding onto their tokens, the one advertiser who would use their tokens to pay for an ad campaign would reach the largest audience because there would be no competitors. So in the end, I think the incentive to hold and the incentive to use the tokens will equal out and come to an equilibrium.

Are you sure of this ? have you given alot of thoughts on this equilibrium. Sounds like a good investment

I now looked more closely at the ICO timeline, and now it seems to me that these are too big bonuses for whales. For example, 60% + 15% in 1 round if more than 150,000 tokens are sold.

App is running well on my smartphone. Search function has to be improved, but it makes a good first impression.

why is the big bonus factor critical to the success for the project?  

Probably minor differences, you can do a lot of fo thins in a browser that you can't in a smartphone, but I don't think actual useful features will be in one and not the other, its necessary that you can do the same thing in both, if not, people will try to use more one than the other.

They has 200k users - this is large audience - when browser version will be available, I think there can be new wave of users, because Facebook every day is losing popularity.

I also stopped using Facebook for various reasons for some time, abusive advertising, data collection for marketing, abusive restrictions and little freedom for users. Surely Sphere is already a reality and something to overcome any and all forms of oppression in its segment