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1.   No Team
-   Most of the ICO have their own team members shown on their site or even on social media. this will help the investor to contact (if they may) any of the members for any queries, research or even for investigation purposes. Always check company details.
2.   No Working Platform before the ICO
-   Not all ICOs without working platform is a scam. Some of them uses this strategy to secure funds. Most of the scam ICO don’t even have any lead developer. If they have one, you can always contact him and ask about some development of the project inside the blockchain.
3.   Resolution of problem in the Blockchain
-   The project`s blockchain must be ready for any shortcomings before it will go mainstream. The more useful the project, the more people will get indulge with the project`s token.

note: These are just 3 basic things to consider in engaging ICO investment, there are still many to think of. The best thing to do before investing is to do your own research regarding you’re interested ICO before investing. You don’t want to end up holding a token without value. Or in crypto term “Shitcoin”. And don't forget to read the ICO`s Whitepaper.

1 and 2 are simple rule that everyone knows even an idiot. In the forest of ICO nowadays, no stupid guy will invest in such project as in 1 and 2.

you might be right. what if an ICO site just put up fake members on their site. like if you contact them, no response will be received? or if there is, it's doubtful. you can feel it because you are not an "idiot" right?. it is simple for you because you already have been engaged with this, however, there are still people who are victimized with fake or scam ICOs. they just tend to take a little look at the site, consider the price of the token, red few, and invest directly. they are people who don't have a vast knowledge about investing in ICO like you are.

When investing in ICO the thing I need to know is Popularity with the community.
A reputable ICO usually receives high praise and support from the community. There are forums and forums around the world that feature ICO investors such as [Suspicious link removed] ... This is where investors around the world discuss cryptocurrency, ICO project points, ICO progress tracking ...
Assessing the reliability of the feedback on the project may be based on the level and level of activity of the commentator. A project of high popularity, which receives a lot of community support, is likely to be successful.

Watch out, this can be really misleading. Look at biggest scams, like rupert murdoch pyramid scheme for billions of $. He had tremendous support from the community of celebrities and business community.
Someone with good marketing skills can sell sand on beach, be vigilant in what you are investing really, do you think someone will make revolution like satoshi nakomoto did? We waited 30-40 years for that and some random guy will make same success ? :) good luck

you need to find out the challenges they want to provide solutions to, checks their social media site.watch out for their advisers and team reputation and years of experience in cryptocurrency.

This is a nice compelling article about ICO investing.
https://medium.com/@moonetize/how-to-choose-an-ico-to-invest-in-ac0ed77c8857